Features: The body of the MK8 nozzle is brass, the gemstone is artificial gemstone. A torque wrench is required during the installation of the nozzle. The nozzle is subjected to a maximum torque of 5 N.m. Exceeding this torque will damage the brass inlay. If you don't have a torque wrench. Then it doesn't matter. Don't use too much force during the installation process, please try to control your strength. 0.4mm nozzle size, no special smell. Suitable for 1.75mm diameter PETG,ABS,PEI,PEEK and other filaments. Specifications: Model: MK8 high temperature nozzle Gemstone: Ruby Nozzle Material: Brass + Artificial Gemstone Nozzle Size: 0.4mm Quantity: 1pc Thread: M6 Filament Diameter: 1.75mm Item Weight(1pc): 3g / 0.1oz Synthetic gemstone parameters: (the following are gem parameters only) Main chemical composition of the material: AL2O3 Purity: > 99.9% Density: 3.9-4.10g/cm3 Melting Point: About 2050 Hardness: Mohs 9 Tensile Strength: 0.18Gpa Compressive Strength: 1.9Gpa Friction Coefficient: 0.1(dry friction coefficient with steel). Package Size: 5.0 * 5.0 * 3.0cm / 2.0 * 2.0 * 1.2in Package Weight: 17g / 0.6oz Notes: 1-3mm deviation is normal due to manual measurement. Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. Packing List: 1 * Nozzle